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Please refer the table given in Over The Air update in CYW43907 for the key differences in OTA and OTA2.
Do either allow partial update - WiFi Stack only / BLE Stack only / User Application only?
>> OTA allows only the application to be updated. OTA2 allows the update of the entire application+ firmware + filesystem. OTA2 does not allow partial update.
Do both provide ability for code verification?
>> I am inferring this as whether the updated image which is OTAed is verfied on the device?
OTA and OTA2 check for a valid image before loading the new image.
Are all WICED radios supported by one or the other OTA or OTA2?
>> Yes. OTA2 is supported only in CYW943907/54907. Rest of the devices support OTA.
The docs directory in WICED(@WICED-Studio-x.x\43xxx_Wi-Fi\doc\) contains documents on WICED-OTA and WICED-OTA2.